Fix Blacksky labeler missing from report dialog
The additionalLabelers variable was assigned as a reference to
MODERATION_AUTHORITIES_DIDS instead of a copy. When BLACKSKY_LABELER
was pushed onto it, it mutated the original array, causing
isNonConfigurableModerationAuthority() to return true for the
Blacksky labeler DID. The report dialog filters out non-configurable
authorities, so Blacksky was excluded from the moderation service
selection.
Fix: spread copy the array before mutating it.